This error is not the real error. What is happening here is that the game is casting an error which is to be shown in a dialog window. But the dialog window is failed being created and therefore throws another error overriding the real one.

I've fixed so that the real error should be shown properly the next time it comes up. So please share the error here again if it comes up in the v0.11.12 BT

I've also solved one crash, so it is possible that this error already is solved. So I will set it to solved with the next version.

Rasmus i got your pm however I have not had a massive crash like i did before, Its just the slowdowns that really need to be fixed so even if the game gets low of i open up the window for the prison that i got the crash on before hasn't occurred again. The game just slows down during massive battles and then speeds up if there's free none battle happening